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 NEW    Bruce Heran outlines the details and construction of his simple DIY 6DJ8 (ECC88) Tube Hi-Fi Headphone Amplifier Project.

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OatleyK281.jpg
OatleyK281.jpgOatley Electronics sub-mini tube/chip amp hybrid K2814244 viewsThere has been a number of hybrids over the years but none more unusual than Oatley Electronics, of Sydney Australia’s, Jan6418/LM1875 kit amp. Not crazy enough for you? How about we throw in a 24VDC International regulated switch mode power supply and build the finished amp as a dual mono construction? Crazy? You expected less from Australian Justic Branko owner of Oatley? Still not crazy enough? How about the amp only puts out 5W. Yes the chip is capable of 20W easy! Think what you can do with this kit.
This is my dead stock, out of the box build. And it sounds bloody great! Good sonic depth with chip amp holographic sound stage and tight, exceptionally controlled bass. And all for AU$29 plus shipping. Nuts!!! Not crazy enough. I added twin UV LEDs on the front panel to indicate when both modules are powered. That’s Crazy.
DIY-5687-Tube-Preamp-Rear.jpg
DIY-5687-Tube-Preamp-Rear.jpgDIY 5687 Tube Preamp - Rear View4240 viewsRear view of my first 5687 tube preamp project. It sounds great for such a simple preamp.
EL84-SE-Tube-Amplifier.jpg
EL84-SE-Tube-Amplifier.jpgEL84 SE Tube Amplifier Project4236 viewsThis is my Single Ended EL84 / 6BQ5 Tube Amplifier project. See my webpage for the schematic. Half of a double triode tube (ECC88 / 6DJ8 or ECC82) amplify the input signal for each the EL84 / 6BQ5 tubes. The speakers in the background are also DIY and use a single Panasonic fullrange driver.
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00097.jpgEI Trans and rectifier4216 viewsStill in the building process, the EI transformer (24VCT @ 6amps) and the rectifiers (MUR860 diodes) and two 10000uF caps.
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top1.jpgPush-Pull 6T9 Stereo Tube Amplifier4214 viewsThis is a project I started some time ago which was inspired by the Spare Time Gizmo's 6T9 Tube Amplifier Kit. I decided to make it push-pull using circuit ideas from my Eico HF-81 and my RCA Receiving tube manual. The combination wood and brass chassis came about when I found a small sheet of brass shoved under a cabinet and long forgotten about at work. It took a bit of work to clean it up and polish it to that shine! The wood is poplar purchased at Lowes, stained with Minwax Red Mahogany stain and finished with Amber Shellac.

Additional information: 6T9 Push-Pull Tube Amplifier
ZCA_2.jpg
ZCA_2.jpgRadoslav's ZCA (SE class-A mosfet amp) 4208 viewsRadoslav has made a very professional looking build of the ZCA.

See the project page, DIY Class-A 2SK1058 MOSFET Amplifier for the schematic.
K12G-Tube-Amplifier-Kit-Inside-Zach.jpg
K12G-Tube-Amplifier-Kit-Inside-Zach.jpgUnderside of Zach's K12G Tube Amplifier Kit4194 viewsThis is an underside view of the K12G tube amplifier kit put together by Zach. You can see that Zach has tried some of the various modifications noted for this kit.

For more information about this tube amplifier kit and possible modifications see the S-5 Electronics DIY Tube Amplifier Kits page
YAHA-Headphone-Amp.jpg
YAHA-Headphone-Amp.jpgYAHA Headphone Amplifier4188 viewsHere is on of my YAHA builds, I have never been a fan of Altoid tins. Later I used the Yaha voltage gain stage in my 12AU7 Tube / IRF612 MOSFET Hybrid Headphone Amplifier project.
Wooden-5687-Valve-Preamplifier.jpg
Wooden-5687-Valve-Preamplifier.jpg5687 Valve Line Preamplifier4179 viewsThis is the second DIY 5687 Valve Preamplifier that I built. The enclosure is a DIY wooden box and painted black.
Fostex-GK120-Speakers-with-F120A.jpg
Fostex-GK120-Speakers-with-F120A.jpgFostex GK120 Speakers with F120A4174 viewsHello - this is a hard to locate set of speakers! The cabinet is a rare speaker enclosure from Fostex - model GK120. The speaker in each cabinet is the famous F120A. The set operates flawlessly - both aesthetically as well as acoustically. The wood (though I do not know the type) is solid and very nice. The enclosures themselves are made of a see-through Lucite and are definitely a conversion piece.
DIY-KT88-SE-Tube-Amplifier.jpg
DIY-KT88-SE-Tube-Amplifier.jpgKT88 Single Ended Tube Amp Build4161 viewsRear view of the KT88 Single Ended Tube Amplifier. The circuit is just like Mikael Abdellah's Single Ended (SE) KT88 Tube Amplifier Schematic.

Additional information and pictures are available on my build log for this project: SE KT88 Tube Amp.
DIY-LM3875-Gainclone~0.jpg
DIY-LM3875-Gainclone~0.jpgDIY LM3875 Gainclone - rear view4144 viewsA gainclone chip amp with an external power supply. The design is based on my Roasting Pan LM3875 Gainclone Chip Amplifier. All wiring is point-to-point.
K-12G-Tube-Amp-Kit-DIY-Enclosure.jpg
K-12G-Tube-Amp-Kit-DIY-Enclosure.jpgK-12G Tube Amplifier Kit and DIY Enclosure4139 viewsForum member DisasterArea has put together a S-5 Electronics K-12G Vacuum Tube Amplifier Kit and built the kit into a fantastic looking enclosure using chassis parts from VT4C.

For more information about this tube amplifier build see this forum thread: First amp build: K-12G tube amp kit.
6C33C-6S33S-Single-Ended-Valve-Amplifier.jpg
6C33C-6S33S-Single-Ended-Valve-Amplifier.jpg6C33C (6S33S) Single-Ended Valve Amplifier4107 views6C33C (6S33S) Single-Ended Valve Amplifier with 6E5P preamp valves. The power supply is external to the amplifier. Additional details for this valve amplifier are available in the 6C33C Tube Amplifier thread.
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OwenSpecialFront.JPGThe Owen Gainclone Special4101 viewsI was commissioned to build my ex-boss a chip amp based on my Synergy LM3875 Gainclone Chip Amplifier. This has two LM3875 modules inside with Alps pot, 4oz solid brass volume knob, two 8000uF caps (red) and 1000uF low ESR line caps. Remote PS (left) has fast switch diodes (snubbed),160VA toroidal transformer. Both amp and PS are housed in die-cast cases and stand on solid brass cones. All point-to-point wiring.
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DIY-KT88-Single-Ended-Tube-Amp~1.jpgDIY KT88 Single Ended Tube Amp4070 viewsFront view of my KT88 Single Ended Tube Amplifier. The circuit follows Mikael Abdellah's Single Ended (SE) KT88 Tube Amplifier Schematic.

Additional information and pictures for this project are available on my build log: SE KT88 Tube Amp.
OTL-Tube-Headphone-Amplifier.jpg
OTL-Tube-Headphone-Amplifier.jpgOTL Tube Headphone Amplifier4067 viewsThis is a picture of a tube headphone amp that I was building but gave up as I could not get it to work properly.
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LidOff.JPG"not another chip amp"4065 viewsAfter the Synergy Gainclone amp I promised myself I would not make another chip amp. The point-to-point gainclone amp modules were made twelve months ago but never got used. They comprise of the LM3875 and 10,000uF caps. The PS is rated 160VA with a scavenged microwave mains filter and a snubbed rec. bridge. The amp is compact and very loud with a full and very extended bass with small bookshelf speakers. You feel this amp could power a whole night club. Well it fills this house with clear clean music! And that is how it sounds -> clear and clean!
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PB220014.JPGPCL86 Single-Ended Amplifier4062 viewsSingle-ended amplifier using PCL86 triode / pentode tube

web: http://www.bartech.rulz.hu/
e-mail: kisskozsa@freemail.hu
Fostex-FE206En-Double-Bass-Reflex-Speakers.jpg
Fostex-FE206En-Double-Bass-Reflex-Speakers.jpgFostex FE206En Double Bass-Reflex Speakers4024 viewsThe finish is satin black stipple and the grills are held in place with four rare earth button magnets. Easy to pop on and off. The stipple effect was produced with a roller going over the fresh paint a number of times as it dried. The drivers huge magnets have bitumanised aluminum foil dampening attached and the internal wiring is two stands of lightly twisted wire wrap wire to each binding post. The top chamber is lined (but not stuffed) with Dacron but the bottom chamber is empty. There is no crossover in these fullrange speakers. Efficiency is 96dB at 8ohms impedance so they work well with flea power tube amps. Sitting higher than the tweeter (wizzer cone) the sound is quite natural with just a touch of forwardness in the mid-range. The speakers not only look stunning they sound excellent for a $500 spend.

For full details see the Fostex FE206En Double Bass-Reflex Speaker project page.

Mark Houston – retro-thermionic
614 files on 31 page(s) 16


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